Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Solubility of NaI in water, methanol, ethanol, propan-2-ol, and also in water + methanol, water + ethanol, and water + propan-2-ol binary mixtures have been experimentally measured using a gravimetric method at temperatures (298.15.303.15, 308.15, and 313.15) K. The combined NIBS (nearly ideal binary solvent) Redlic Kister equation is used to fit experimental solubility data at constant temperature. The densities of the saturated solutions are also reported in pure and binary solvent mixtures at temperatures mentioned above. Thermodynamic functions including ?Hsoln0, ?Gsoln0, and ?Ssoln0 of solution of NaI are obtained from the modified van t Hoff equation. A comparison of the relative contributions by enthalpy (?H) and entropy (?TS) is made which indicated that the main contributor to the positive standard molar Gibbs energy of solution of NaI is the entropy for solution of NaI in water + methanol having xC0 less than 0.5 and for all other solutions it is enthalpy.